After you have install Microsoft Dynamics NAV Server, the
default configuration is for the service to log on using the
NT Authority\Network Service account. If Microsoft
Dynamics NAV Server and SQL Server are on different computers,
then it is recommend to configure Microsoft Dynamics
NAV Server to log on using a dedicated Windows domain user account
instead. This account should not be an administrator either in the
domain or on any local computer. A dedicated domain user account is
considered more secure because no other services and therefore no
other users have permissions for this account.